CAESAR(6) CAESAR(6)
NAME
caesar - decrypt caesar cyphers
SYNOPSIS
caesar [ rotation ]
DESCRIPTION
The caesar utility attempts to decrypt caesar cyphers
using English letter frequency statistics. Caesar reads
from the standard input and writes to the standard output.
The optional numerical argument rotation may be used to
specify a specific rotation value.
The frequency (from most common to least) of English let-
ters is as follows:
ETAONRISHDLFCMUGPYWBVKXJQZ
Their frequencies as a percentage are as follows:
E(13), T(10.5), A(8.1), O(7.9), N(7.1), R(6.8),
I(6.3), S(6.1), H(5.2), D(3.8), L(3.4), F(2.9),
C(2.7), M(2.5), U(2.4), G(2), P(1.9), Y(1.9),
W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13),
Q(.11), Z(.07).
Rotated postings to USENET and some of the databases used
by the fortune(6) program are rotated by 13 characters.
November 11, 1990 1